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Gaokao Physics Practice Question

在光滑桌面上将长为 $\pi L$ 的软导线两端固定, 固定点的距离为 $2 L$, 导线通有电流 $I$, 处于磁感应强度大 小为 $B$ 、方向坚直向下的匀强磁场中，导线中的张力为

  1. A.$B I L$
  2. B.$2 B I L$
  3. C.$\pi B I L$
  4. D.$2 \pi B I L$

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